No History Created When Performing Email Merge

I recently sent out a number of email messages using the merge function. I first trying it out on one sample to my email address. It recorded properly to history. When this larger group was used, no history was recorded. Looking this issue up (below), it apprears there is only a work around that takes a lot of time and is a pain.

Does anyone have any ideas on how to make this work like it should instead of having to go back manually? I'd appreciate the feedback.